Senko HZ50X1046DPFIR 1/1.8" 10-500mm F4.6 Motorized Zoom & Focus with DC Auto-Iris C-Mount Lens, Presets, Day/Night, 2 MP Rated, "Fog-Free" Function, Compact Size
Senko HZ50X1046DPFIR 1/1.8" 10-500mm F4.6 Motorized Zoom & Focus with DC Auto-Iris C-Mount Lens, Presets (Zoom & Focus), IR Corrected (Day/Night), 2 Megapixel Rated (HD), "Fog-Free" Function, Compact Size
Focal Length: 10-500mm
Iris Type: Auto-Iris
Technical note on Fog-Free function:
The “fog free” function uses a visible cut filter to mitigate the effects of fog. This means when the “fog free” function is employed a cut filter is deployed in the lens that cuts all wavelengths under 800nm, and transmits only wavelengths of more than 800nm.
The theory behind this is based on physics in that the longer wavelength light (above 800nm) will go around particles in the air (i.e., moisture (fog) or dust) while the short wavelength light (under 800nm) is blocked by the particles and does not go forward. In doing this, the longer wavelength light can reach the image pickup device and the camera can “see through” the fog.